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Add a new form of RLDC which maps directly to the ISA definition of rldc: RLDC Rs, $sh, $mb, Ra. This is used to generate mask constants described below. Using MOVD $-1, Rx; RLDC Rx, $sh, $mb, Rx, any mask constant can be generated. A mask is a contiguous series of 1 bits, which may wrap. Change-Id: Ifcaae1114080ad58b5fdaa3e5fc9019e2051f282 Reviewed-on: https://go-review.googlesource.com/c/go/+/531120 Reviewed-by: Matthew Dempsky <mdempsky@google.com> LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com> Reviewed-by: Lynn Boger <laboger@linux.vnet.ibm.com> Run-TryBot: Paul Murphy <murp@ibm.com> TryBot-Result: Gopher Robot <gobot@golang.org>
33 lines
1.1 KiB
Go
33 lines
1.1 KiB
Go
// asmcheck
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// Copyright 2023 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package codegen
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// A uint16 or sint16 constant shifted left.
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func shifted16BitConstants(out [64]uint64) {
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// ppc64x: "MOVD\t[$]8193,", "SLD\t[$]27,"
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out[0] = 0x0000010008000000
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// ppc64x: "MOVD\t[$]-32767", "SLD\t[$]26,"
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out[1] = 0xFFFFFE0004000000
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// ppc64x: "MOVD\t[$]-1", "SLD\t[$]48,"
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out[2] = 0xFFFF000000000000
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// ppc64x: "MOVD\t[$]65535", "SLD\t[$]44,"
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out[3] = 0x0FFFF00000000000
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}
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// A contiguous set of 1 bits, potentially wrapping.
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func contiguousMaskConstants(out [64]uint64) {
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// ppc64x: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]44, [$]63,"
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out[0] = 0xFFFFF00000000001
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// ppc64x: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]43, [$]63,"
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out[1] = 0xFFFFF80000000001
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// ppc64x: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]43, [$]4,"
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out[2] = 0x0FFFF80000000000
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// ppc64x/power8: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]33, [$]63,"
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// ppc64x/power9: "MOVD\t[$]-1", "RLDC\tR[0-9]+, [$]33, [$]63,"
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// ppc64x/power10: "MOVD\t[$]-8589934591,"
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out[3] = 0xFFFFFFFE00000001
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}
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